 The battalion traces its lineage to Company A, 158th Aviation Battalion, activated on 25 July 1968, for assignment to the 101st Airborne Division (airmobile) when the division, already in Vietnam, was transitioning from a parachute unit to a helicopter-transported airmobile unit.The 2nd Battalion was constituted on 25 July 1968, in the regular army as Company B, 158th Aviation Battalion, nickname "Lancers" an element of the 101st Airborne Division (airmobile), and activated at Fort Carson, Colorado.It was reorganized and redesignated on 16 September 1987, as Headquarters and Headquarters Company, 2nd Battalion, 158th Aviation, and relieved from assignment to the 101st Airborne Division (air assault)(organic elements concurrently constituted and activated), and on 15 September 1996 it was inactivated at Fort Hood, Texas.